Diaphragm pump



Aug. 19, 1943. J, F, MALSBARY ETAL. 2,326,474

DIAPHRAGM PUMP Filed July 19, 1939 BY MLTEK W721 na y @149 ATTORNEYS Patented Aug. 10, 1943 DIAPHRAGM PUMP Job F. Malsbary and Walter w. Taylor,

Oakland,

Application July 19, 1989, Serial No. 285,334

2 Claims. (Cl. 28629) The present invention relatesto improvements in diaphragm pumps, and has among its objects the provision of a pump of the character described in which the useful life of the pump may be extended and the amount of repairs thereon materially reduced.

It is well known that a diaphragm pump is an ideal unit for producing a uniform output of water or other. liquid. However, under pressure and long use the diaphragms fall, which results in the seepage of water from the pumping compartment into the bearings of the pump.

Heretofore, whenever the diaphragm failed,

the water would reach the bearing compartment and destroy the bearings. Each'time adiaphragm failure occurred, a new set of bearings would be required. o

It is proposed in the present invention to provide means for preventing water or other liquid from reaching the bearings in the event of a pumping diaphragm failure.

More particularly described, we propose to use a diaphragm for forming a bulkhead between the main pumping diaphragm and the bearing supports for the crankshaft, this bulkhead diaphragmhaving a liquid-tight seal with the connecting rod and the pump housing.

It is further proposed to arrange the pump housing in such a manner that the bulkhead or secondary diaphragm may be readily inserted through a pump embodying our invention, parts being shown in elevation; and

Figure 2, a side elevation oi the same pump. ,While we have shown only the preferred form of our invention, we wish to have it understood that various changes or modifications may be made withinthe scope of the claims hereto attached without departing from the spirit of the invention.

In carrying our invention into practice, we provide a pump housing generally indicated at I and including sections 2, 3 and 4, these sections being removably secured together by bolts 5. and 6 passing through companion flanges I and 8, respectively. This pump housing provides a chamber 9 extending lengthwise thereof.

Figure 1 discloses a main diaphragm it that is mounted across the chamber 9 and which coacts with the housing section 4 to form a pumping compartment II. The fluid l2 enters the pumping compartment through a valve-controlled passageway it during the suction stroke and is discharged through a valve-controlled outlet passageway it during the compression stroke.

The diaphragm i0 is secured between the companion flanges 8 and has a connecting rod l5 attached thereto by any suitable means. For this purpose we have shown a stud I6 passing through a large washer i1 and into a threaded bore l8 formed in the adjacent end of the connecting rod.

A crankshaft i9 is journaled .in the pump housing in suitable bearing supports 20. and has an oiiset or eccentricll thereon, which engages with the inner race of the connecting rod hearing 22. As the crankshaft is rotated, such as by means of a pulley 23, a connecting rod I5 is reciprocated and the end 24 of the reciprocated' rod is moved in a circular path.

The main pumping diaphragm it normally fails in the general area indicated at 25 after long use, and the water or 0th r fluid l2 passes through the ruptured diaph agm under great pressure. We provide a drain outlet 26' in the lower part of the housing section 3 to allow the water to drain therefrom.

A bulkhead or secondary diaphragm 26 is, mounted across the chamber 9 substantially midway between the main pumping diaphragm I0 and the bearing supports 20. The purpose of this bulkhead diaphragm is to prevent water from gain access to the bearing supports in the event the pumping diaphragm should rupture.

The bulkhead diaphragm 26 has a rim secured between the companion flanges I in a transverse plane and has a sleeve 21 surrounding an intermediate portion of the connecting rod, the sleeve being located substantially opposite the rim. The rod has an enlarged portion 28 of circular cross-section, in which an annular groove 29 is formed. A suitable clamping ring 30 anchors the sleeve 21 to the connecting rod so as to form a liquid-tight seal therewith.

The diaphragm 26 projects inwardly toward the connecting rod in the plane of the rim through a short distance and is curved'as at 3| 2 2,820,474 to permit free movement or the sleeve and the portion for accommodation in the open section connectingrod.Thisdiaphragmismadeirom oithehousing,oneoi.saidporticnshavinga materialthatwiilresistoilorgrealeandwater.

'Thecilorgreasemaybeintroducedintothe compartment containing the crankshaft it through a suitable fltting 8|.

In order to iacilitate the assembly or the pump. we have made the connecting-rod il in two sections 32 and it, the former having a stub shaft 34 threaded in a bore ll formed in the latter.

Havin thus described the variou parts or our pump, the operation thereof may be readily understood.

- The connecting rod ii is reciprocated by means of crankshaft it, which causes the main pumping diaphragm Iii to be flexed. The liquid i2 is drawn in through the one-way valve ll during the suction stroke and forced out or the pumping compartment and through' the one-way outlet valve i4 during the compression stroke.

In the event that the main pumping diaphragm i is ruptured, the liquid i2 is prevented from reaching the bearing supports 2. by the bulkhead diaphragm 28. It will be appreciated, or course,-

that the water or other liquid will pass through threaded cavity and the. other portion a threaded stud engllinl in said cavity for Joining the portions substantially opposite the flanges, a sealing diaphragm having an outer rim clamped between the two flanges or the housing, an inner sleeve fitting upon the inner portion or the connectin rod near the ioint and a waved body between the rim and the sleeve, and mean for clamping said sleeve upon saidinner portion or theconnecting rod whereby the outer portion'ot the latter may be unthreaded from the inner portion withoutidisturbing the diaphragm seal.

2. In a pump or the character described, a cylindrical housing or substantially uniform cross-section having a-closed end and an open end and comprising two sections substantially equal in length and having companion flanges and means for securing the same upon oneaanother. a rigid connecting rod extending through the diaphragm II at a high rate of speed and the bulkhead diaphragm 28 serves as an elective barrier to protect the bearing supports 2|. The water finally drains from the compartment between the two diaphragms through the outlet opening 26.

1. In a pump or the character described, a cylindrical housing having a closed end and an open end and comprising two sections having companion flanges and means for securing the same upon one another, a rigid connecting rod extending through the length of the housing and being reciprocable therein and comprising two portions, an inner portion for accommodation in the closed section of the housing and an outer the length of the housing and being reciprocable therein and comprising two portion of substan tially equal length, an inner portion for accommodation in the closed section or the housing and an outer portion for accommodation in the open section or the housing one or said portions having a threaded cavity and th other portion a threaded stud engaging in said cavity for joining the portions substantially opposite th flanges,

a sealing diaphragm having an outer rim clamped 4 between the two flanges of the housing, an inner sleeve fitting upon ,the inner portion of the connecting rod near-the joint and a waved body between the rim and the sleeve, and means for clamping said sleeveupon said inner portion of the connecting rodv whereby the outer portion of the latter may be sunthreaded from the inner portion without disturbing the diaphragm seal.

' JOB F. MAISBARY.

WALTER W. TAYLOR. 

